Safety device for extractors



E. WLMILLER. SAFETY DEVICE FOR EXTRACTORS.

APPLICATION FILED NOV. 23,1916. RENEWED JAN. 10,1920.

1,352,827, Patented Sept. 14, 1920.

9 $HEETS--$HEET l- ERNEST W. MILLER INVENTOR,

A TTOR NE Y5.

E. W. MILLER.

SAFETY DEVICE FOR EXTRACTORS.

o NOV-23,1916. RENEWED IAN. 10.1920.

1,352,827, PatentedSept. 14,1920. I v 9 SHEETS-SHEET 2- APPLICATION FILE ERNEST W; MILLER INVENTOR.

ATTORNEYS.

E. W. MILLER.

SAFETY DEVICE FOR EXTRACTORS. N FILED NOV. 23, 1916. RENEWED JAN. 10,1920.

Patented Sept. 1920.

' 9 SHEETSS T 3- APPLICATIO ERNEST W. MILLER INVENTOR.

7 BY W A TTOR NE Y5.

. E. W. MILLER.

SAFETY DEVICE FOR EXTRACTORS. APPLICATION F|LED-NOV-23, I916- RENEWED JAN. 10, 1920.

1,352,827, I Patented Sept. 1920.

- I 9 SHEETS-SHEET 4.

I ATTORNEYS.

E. W. MILLER.

SAFETY DEVICE FOR EXTRACTORS.

FILED NOV- 23,1916- RENEWED JAN. 10,1920.

7 PatentedSept. 14, 1920.

9 SHEETS-SHEET 5- APPLICATION I ATTORNE Y5.-

E.'W. MILLER; SAFETY DEVICE FOR' EXTRACTORS.

79 ERNEST W. NHLLER INVENTOR,

BY M ATTORIyE S.

APPLICATION FILED NOV. 23,191 6- RENEWED JAN. I0, 192 0.

E. W. MILLER.

SAFETY DEVICE FOR EXTRACTORS. I I APPLICATION FILED NOV-23,1916- RENEWED IAN. 10,1920.

1,352,827w PqtentedSept. 14,1920;

ERNE$TWfMlLLER A TORNEYS.

E. 'w. MILLER. SAFETY DEVICE FOR EXTRAGTORS. APPUCATION FILED NOV- 23,1916- RENEWED JAN.

Patented Sept; 14, 1920. I

9 SHEETS--SHEET 8- ERNEST W. MILLER INVENTOR.

A TTORNE Y5.

E. W. MILLER. SAFETY DEVICE FOR EXTRACTORS.

I APPLICATION FILED NOV- 23,1916- RENEWED JAN; 10, 1920- 1,352,827 PatentedSeptz 14, 19 20.,

I 9 $HEET$-SHEET 9- 34 141 11.9 1 I 139 124 /jzw 120 v I 132 A16 no I I 137 A0 f I I 42 ERNEST \MMELLER .ZNVENTOR. all. 7 I

41 A? W @W UNlTED- ST ATES PATENT" orricagx ERNEST w, MILLER, or. NORWOOD, o

, ASSIGNOR TO THE AMERICAN LAUNDRY- MACHINERY COMPANY, OF cfNcINNATI, OHIO, A coRPoEA'r oN OF 01110."-

SAFETY DEVICE To all'wlwm it may concern)? Be it known that I, ERNEST W. MILLER,

a subject of the King of Sweden, residin atNorwood, in the county of Hamilton and 5 State of Ohio, have invented certainnew and useful Improvements in Safety -Devicesfor Extractors, of which the following is a specification. This" invention relates to extractors, such as are used for extracting liquids and moisture .from cloth, woven fabrics, garments, pulverized or granulated materials, or other substances. The invention has particular relation to that class of machines in which the articles to-be treated are placed in a basket or container-which is rotated at a high rate of speed to drive off or expel the moisture or liquids by centrifugal force.

Some of the more important objects of the invention areto safeguard the machine by insuring a careful'and thorough'observation or inspection of the machine by the operator at the time of starting to see that 'the load is evenly balanced tor distributed and that the "various parts of themachine are in working position; to safeguard the operator by preventing him from starting the machine unless it is in proper condition for starting and safe for'running; and to. '30 automatically stop the machine after the lapse of a period of time 'whoseduration is under the selective. control of the operator.

sure release ,of the brake in starting'the machine; to lock theucover in closed posi-v tion while the machine is running and absolutely prevent starting or operation of the machine whenever the cover is open; to hold the brake released while the machine is run- 4 0 ning; and to apply. said brake and out 01f the power at th machine; v v

Further objec s of the invention are in part obvious an in part will appear more in .detail hereinafter. The invention comprises the extracting machine hereinafter described and claimed. In the drawings, Figure 1 represents-a right sideeleva'tion of the machine; Fig.

' 2-is a left side elevation, partly broken out and in. section, the timing mechanism being omitted; Fig.3 is a detailed horizontal set tion on the line 33, Fig. 2; Fig. 4 is a broken out perspective view. of the lower I portion of the machine,-.'showi ng the foot Further objects 0 the invention are to'in-.

e proper time to stop the Eon Ex'rEAc'ro s.

Specification of Letters Patent. katent d 14 1920 Application filed November 23, 1916', Serial No. 133, I

' treadle control device; .Fig. 5 is a detail per-. spectlve view showing Ithe cover open and the locking deitices therefor; Fig. 6 is an elevation of the driving mechanism for the timing device; Fig. 7 is an elevation from the left in Fig. 6; Fig. 8 is aperspective view, looking downward at the right hand end of the timing device; Fig. 9 is across -sect1on on the line 9 9, Fig. 10, looking in the direction of the arrows; Fig. l0 is a bottom plan view of the timing device, the bottom cover plate being omitted; and showing theparts in their positions when the machine is running; Fig. 11 is a similar view, showing the parts in their positions when the machine has been stopped; Fig.

.i 12 is a front elevation of' the treadle locking and releasing mechanism, the front cover platebeing omitted and part 0f the view being a section on the line 12-12, Fig. 13'; Fig. 13 is partly an elevation from the left in F ig.- 12, and partly a section on the line 1313, Fig. 12;. Fig. 14 a detail view, corresponding to Fig. 12, and showing another position of the treadle lock-in and controllingdevices; ig. 15 .is a detail side elevation of they motor controlling switch and its operating levers; Fig. 16 is an ele-.

p vation from the left in Fig. '15,'the casing being partly broken out to -showthe switch;

' Fig. 17 is a perspective'vlew of the switch inclosing casing; Figfi18 is an elevation of the main starting and stoppingswitch device, the casing cover being omitted; Fig.

I 19' is a detail section on the line 19-19,

Fig. 18; Fig.-20 is a detail section on the line 20-20, Fig. 18; and Fig. 21 isv a diagrammatic view of the electrical circuits.

I The machine shown, in the drawingscoinprisesa suitable frame 1- having a base .2 supporting the casing or jacket 3 which incloses the rotating basket 4: supported by the vertical shaft 5. Onsaid shaft isthe combined pulley and brake drum 6 rotated by the belt 7 driven by pulley. 8,-said latter. pulley being operated by. any suitable power source, suchas the electric motor-9.

Between the two halves of the belt, and k opposite drum 6, is abrake shoe 10 car ried by a lever 11 pivoted at 12 to the sta- 7 tionary frame and. extending forwardly around'the shaft 5 to the front of the machine-where it is connected by-an" adjustable link 13 to one arm ofv afoot treadle 14. A

tension spring 15 attachedto the lever 11 110 041. .Renew ed J'anuary I6, 1920. Serial No. 350.682. Q i

tends to move the brake shoe intoengagement with the drum and elevate the foot plate 16 of the treadle. N

The jacket or casing has an open top through which the material to be treated is introduced into the basket,said-top being closed by a cover 17 hinged at 18 to the casing and provided with a lifting handle 19. Y

Suitable means is provided for preventing elevation of the cover when the machine is running, for permitting the cover to be elevated when the machine is idle, and for preventing the operator from starting the machine unless the cover is closed. For this purpose the cover is provided beyond the hinge 18, with a rearwardly extending bracket supporting an arm 20 curved around the 'hinge axis. In the closed position of the cover, shown in Fig. 2, the end of said arm lies opposite a blank portion of a locking slide '21 movable vertically in a guide 22 on the frame and which prevents movement of said arm or the cover connected thereto. Under certain conditions, however,

as will appear, the slide 21 may be elevated to the position shown in Fig. 5 by turning a gear segment 23 having an operating handle 24 and which segment meshes with rack teeth 25 on the slide. In this position. of the.

slide the end of arm 20 is opposite and will pass through a hole-26 in the slide, which permits the cover to be elevated.

. Slide 21 is connected by a rod 27 to a lever 28 (Fig. 2) pivoted at 29 to the'frame and having two yoke arms 30 provided with fiber shoes pivoted atthe end of said arms,

to support and control the vertical move-- .ment of a circular frame 31 having vertical the balls 35. Above the frame 31 is a spider sliding movement on a sleeve 32 fixed to the shaft Said frame has a plurality '(three being shown) of channel shaped radiating seats 33, whose bottoms are inclined outwardly and upwardly, asat 34, and support 36 having three arms 37, one lying over each seat 33, the outer ends ofsaid arms having recesses 38 to receive theballsl When the machine is not running the balls 35 lie-close free end engages a loop or opening in the upper end of a vertically sliding switch operating rod 40. The switch controlled by said rod, to be hereafter described, is in a circuit which controls the main circuit of depressed.

the motor 9. When rod 40 is elevated the switch is open. Therefore whenever the cover locking device is released, as shown in Fig. 5, the main motor circuit is open and the machine cannot be started unless the cover is closed and slide 21 and lever 28 are Rod 40 carries an insulated sleeve 41 which in the depressed position of said rod, shown in Figs. 15 and 16, completes the circuit between two spring contacts 42 connected to the motor controlling circuit. Said rod slides vertically in guiding openings in a hollow box 43 and its lower endlies above a switch opening lever 44 pivoted at 45 on a stationary bracket 46 and having a bent arm 47 extending around beneath the box and terminating above the foot treadle 14. (See Fig. 4.) The switch is closed by a compression spring 48 and is opened or held open by either of the levers 39,44. The front'end of lever 47 is slotted to receive a 'bolt 49 loosely connecting said lever to a vertically slidable treadle. locking bar 50 connected by links to an arm of the treadle 14.

If the cover, 17 is closedfso that the switch endof lever 39 has released the rod 40 depression of the foot treadle 14 also depresses the switch end of leven 44 which allows the switch 41, 42, to close.

The bar 5O- slides vertically in the front portion of the hollow box 43, its upper end having a piston 5 working in a cylinder 52 and serving as dash pot to steady and slow up the brake applying movement of the foot treadle caused by spring 15. At one side of said bar is a rotatable locking or latching shaft 53. turning in openings in a frame 54 and having its intermediate portion cut away on one side, as at 55, to form a recess to receive the bar 50 when in its depressed position, as in Fig. 14.- In this po- 'sition the brake is applied and the machine is not running. Vhen the bar 50 is elevated by pressing down on the foot treadle 'the shaft. 53 turns to the position shown in Fig. 12 and enters a recess 56 below a wear piece 57 on the bar, said shaft being turned by a tension spring 58 in the hollow box 43 connected to a bent rod 59 extending laterally from one end of the shaft and into said box. In this position shaft 53 serves as a latch to'hold the foottreadle in its depressed position. I y

- When the latch 53 turns to the position of Fig. 12 the free end of rod 59 passes the hooked end 60 of a lever 61 which prevents rod 59 from dropping until freed from said hook. The upper arm of said lever ha a slot 62 to receive a pin 63 on a lever 64 pivoted at 65 to the frame 66 of a magnet coil 67, a portion 68 of said lever serving as the armature for said coil. When said coil is deenergized lever 64 drops to the full line position Fig. 13 and holds the latch lever attracted and the rod 59 is released, thereby releasing the rod from latch 53 and arm of a pivotedlatch lever 92, the other arm of which has a latch hook 93 normally held down by a tension Spring 94 in the 1' position shown in Fig. 10. After setting described, the time control button 95 is pushed in, which oscillates 96 past the latch hook 93 to the holding position, Fig. 10. In this position a contact When the alarm bell 105 rings the op era tor knows that the machine is stopped.

a small stop lever He thereupon resets the timing mechanism by moving to its proper position the trav- 5 permitting the foot treadle to rise and the 97 on the button closes a circuit across two brake to apply. contacts 98 which are in the same motor con- I The circuit through the coil 67 is closed trolling circuit including the switch 41', 42. automatically to stop themachine bya tim- Unless this circuit is completed the motor ing deviceset by the operator when starting cannot be started. When lever 90 is oscil- 10 the machine and arranged to stop it after lated by the traveler the time control butthe lapse of any desired period. ton is released from the hook 93 and forced The timing device and its operating mechout by its spring 99, causing a second conanism are shown in Figs. 6 to-11, inclusive. tact 100 on said button to momentarily en- The device is driven by the motor 9, whose "gage two contacts 101 in circuit with the 15 shaft is coupled to the shaft of a worm 69 solenoid 67, thereby energizing said solenoid in a gear casing 70, and which worm.drives which, as before deseribed, applies the brake a worm wheel 71 and a set of speed reducing and also opens the switch 41, 42 in the mogears indicated generally at 72, and the last tor controlling circuit, thereby stopping the" one of which, marked 73, is rotatably machine. Simultaneously an insulated con- 20 mounted on the reduced end of a screw shaft tact 102 (in the'lever 92 engages two contacts 74. Gear 73 is fast with a notched wheel 103 in a supplemental circuit (Fig. '21) conor.'ratchet 75 whose periphery is engaged taining a battery 104 and alarm such as the by a spring pressed pawl or dog 76 on an bell 105,. which rings until the machine is arm 77 fixed to rotate with the screw shaft. again filled, set and started, and is a con- '2 5. The wheel 75 and pawl 76 form a yielding or stant reminder that the machine awaits atslip connection between the screw shaft and tention.

motor drive, so that the motor will drive "Figs. 18, 19 and 20 illustrate the start .the screw shaft until rotation of said shaft and stop' buttons hr switches. .As shown is prevented by the stop devices to be dethe stop button 106 carries two contacts 30 scribed, whereupon the wheel 75 will rotate of which one, marked 107, cooperates with idly past the pawl until the motor stops, two contacts 108 in circuit with the switches thereby preventing breakage. The screw 41, 42 and 97, 98, while the other, marked shaft also has a head 7 8 on its opposite end 109, co6perateswith two contacts 110, in ciroutside of the casing 79 in which it rotates, cuit with the solenoid 67. The start butand-the slip connection enables saidshaft 7ton 111 has a single ontact 112 cooperatingto be rotated relative to its driving mechawith two contacts 153 in a starting circuit nism for fine setting of the timing device. to be referred to. '114 represents a signal I Above the screw shaft the casing is rolamp which is lighted when the machine is vided with a longitudinal slot 80 w ose running and indicates its operatingcondi- 40 edges serve as guides for a traveler 81 protion;

vided at one side with a pointer 82 travel- The extractor described operates as foling along a scale 83 which may be graduated lows: Referring to Fig. 21, L and L repin any desired units, say minutes. In the resent the main current leads, the circuit traveler is a stem 84 terminating at its lower across whichis closed by the line switch 115. 45 end in anut segment 85 normally held en- Heavy line-116 represents the main circuit 10 gaged with the threads of the screw shaft to the motor 9, including the field coil 117 ..by a pressure spring 86. The nut may howand the heavy resistance 118, as well as a. ever, be freed from he screw by pressing lock out coil 119 on'the core of an electro down on the thumb piecev of a pivoted lever magnet which controls a normally open 50 87 connected at 88 to the outer end of rod switch 120 to be referred to, said circuit 84, which enables the traveler to be adreaching the other side of the line through justed to any desired position along its path the normally openv main motor circuit conof movement and coupled to the screw shaft, trolling switch 121. 122' represents the for determining the period of operation of shunt field coil. The light line 123 repre 55 the machine. sents what may be called a primary circuit, 4 Operation of the machine causes the in other words the circuit before referred traveler to move along the screw shaftauntil to which controls the main motor' circuit. it engages the short arm 89 of a lever 90 This circuit 123 includes the coil 124 of an whose other arm is provided with an adelectromagnet operating the main motor 60 justable abutment screw 91 engaging one switch 121. 125

" 65 the traveler to the proper time position,-as

eler 81, allowing the latch lever 92 to be 13d cuit of the alarm bell 105 and stopping the released by completionof this 121: Current then same. ,Latch lever 93 is then in position to latch and hold the time cont rolled but ton 95 when pushed in. Said button is then pushed in, closing the.circuit 123 through the contacts.97 and 98. The treadle 16 is then depressed, which releases the brake and allows the spring 48 to close the switch 41, 42, completing the circuit 123 to the contact 1080f the stop button. The brake is held the mechanism shown in Figs. 12 and 13, awaiting energization of the magnet coil 67 for releasing the latch and causing ap lication ofthebrake. The circuit through coil 67 is simultaneously broken at the contacts 101. The operator now presses the starting button 111, completing a, circuit from the point 108 across the contacts 112 and 113, thence through wire 125 to the other side of theline.

motor control circuit 123, 125, energizes coil 124, which attracts its armature and closes the main'motor switch flows .as follows: from the mainline switch by way of wire 116 129 *to the contact to the point 126, where the current -divides, onebranch proceeding by way of series field .117, motor 9, resistance 118, and lock put coil 119 to the point v127 thence by way of wire 128, through switch; wire 130, andto the other side of the line. The other branch 6f the, circuit is through the shunt field coil 122 and by way of wire 131' to the point 132, where the 134 on-the same core as the lock out coil 119, but the winding of which is reversed as regards the coil'119 so as to oppose the same in its electromagnetic efli'ect. .From current roceeds by way of wire 135 to the point 13 and thence by way of the contact of switch 121 to the point 130. The other branch of this circuit from point 132 is by way of a holding resistance 137 to the switch wire 129. This holding resistance limits the current in the coil 134 to safe value. '-While said coil receives full voltage at the time of operation it will not stand it continuously an is therefore limited by the resistance 13 Current also 116 by way of wire 138 to the lamp 114,

thence to the point 139 and by way of resistance 140 to the point 108 and by wire 125 to the other side of the line. This lights the, lamp and the resistance 140 dims the lamp at the moment of starting;

The conditionsjust established must be maintained for an appreciable time, say 15 seconds or so, in order to keep the machine running. This period is necessary to effeet the closure of the switch 120 establishbrake holding adjustment Final I when current drops,

divides, part proceeding by holding effect,

' remove his finger and the motor will continue to operate, due -to the establishment of a secondary holding from the point108 by way of wire" the coil 134 the-- flows 'from the" motor \lead 7 it gets to running well, and compelling him to observe it long-enough to be sure that it is safelyoperating. If he leaves too soon the machin Will automatically stop because the permanent circuit has not been completed. w

' Assuming that the operator keeps his fin-' er onthe starting button for the proper length of time the motor picks up speed and vthe current drops .to a predetermined value capable'of variation by manipulating the of the tension of .the opening of switch 120. When the startspring 120 first pressed current flows ing button is through both of the coils 119 and 134, but

said coils are opposed in effect. Coil 134 tends to attract the armature and close the switch, while coil 119 tends to repel the armature and open the switch. At thermoment of starting the eifect'of coil 119 pre-' but dominates and the switch remains open,

as stated, the effect of lockout coil 119 is reduced to such an extent that coil 134 becomes preponderating and closes switch 120, thereby short circuiting the resistance 118 by way of wire 141 and switch 120 to the point 127, the motor thereupon coming across the line and running at normal speed. Lock out coil 119 is also short circuited and coil 134 exerts maximum maintaining switch 120 The operator can therefore safely from the starting button closed.

circuit 142, and resistance 140 to the thence byway of wire 143 and switch 120 to the other side of the line. new circuit is also established for the signal lamp 114, the current from which passes from said lamp to the .point 139 and thence by way of switch 120 to the other side of the line.

The machine may be stopped in either of two ways, first by hand, and second automatically. Both methods of stopping the machine bring it to rest by applying the brake "and opening the main motor circuit, while the automatic stopping device also rings the alarm bell. If the stop button 106 is pressed the permanent motor controlling circuit 123, 142 is broken at the contacts 107 108, thereby deenergizing magnet coil 124 and allowing the main motor circuit switch 121 to be opened by its spring 121. Also, the second set of contacts 109, 110, of the stop button momentarily close a circuit point- 139,

motor before the permanent motor controlling circuit is broken at the contacts 107, I 108. E'riergization of coil 67 operates the mechanism shown in Figs. 12 and 13 and releases thebrake for application to slow down the rotation of the basket.

If the time controlled switch automatically operates by its traveler '81 reaching the end of its stroke, the permanent motor controlling circuit 116, 142, is broken at the contacts 97 98, but before said circuit is broken a shunt circuit is established asbefore, through the solenoid 67 by way of contacts 100, 101, producing the same effect as by pressing the stop button. The subsidiary alarm circuit is also reestablished.

The ,machine described, together with the circuits controlling the same, is very eflicient and safe in operation. The machine can not be started until all of its parts have been properly adjusted by the operator and are in condition for working. The machine will not continue to operateunless the operator stays by it long enough to see that it is operating properly, and if, in attempting to start the machine, he perceives that it is unevenly loaded it can be readily stopped to balance the load. The cover can not be opened'while the machine is running, nor can the machine be started while the cover is open. The automatic brake also gradually slows down the rotation of the basket soas to prevent strain upon the working parts. Other advantages of the invention will'readily occur to those skilled in the art and it is to be understood that the invention is not limited by the particular embodiment thereof shown in the drawings or described in the foregoing spec1ficat1on,.but covers anymodifications and variations therein within the scope of the claims appended hereto.

\Vhat'I claim is 1. An extractor, comprising a rotating basket, an electric motor for driving the same, a motor circuit including a switch, a controlling circuit for actuating said switch and including a second switch, said controlling circuit when completed closing said motor switch, a brake for said basket, and a cover for closing the opening to said basketfsaid second switch being controlled by either said brake or cover.

2. An extractor, comprising a rotating basket, power means for rotating the same, adjustable means arranged to cut off the power from said driving means aftera predeterminedv period whose duration is under the control of the operator, and means for preventing actuation of said machine unless said power cut ofl? means is set.

3. An extractor, comprising a rotating basket, power driving means therefor, a. time control device for cutting off the power from said driving-means after a predetermined period, a friction brake for said basket, and means operated by said time control means for causing application of said brake to stop the machine. I g 4:. An extractor, comprising a rotating basket, means for rotating the same, a time control device for stopping the machine after a predetermined period, ,a brake for said basket, a cover closing the opening to said basket, and means for preventing operation of said machine unless the cover is closed, the brake is released, and the time control device is set.

5. An extractor, comprising a rotating Pbasket, means for, rotating the same, a time control device for stopping the machine after a predetermined period, a brake for said basket, a cover closing the opening to said basket, means for-preventing operation of said machine unless the cover is closed, the brake is released, and the time control device is set, and means for producing an application of the brake when the time control device operates. v

6. An extractor, comprising a rotating basket, an electric motor for rotating said basket, a motor circuit including a normallyv open switch, an electromagnet for closing said switch,-a starting circuit including said electromagnet, and a normally open starting button, and means arranged to establish a permanent circuit through said electromagnet for holding the main motor circuit switch closed when said starting button is held closed for a redetermined period.

In testimony w ereof I aflix' my si nature.

1 ERNEST W. MIL ER. 

